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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a073f91bc3486e40cc1ee7601a9aa7b6cd1b822a0c3fd6dac0e84186e09621' 
  AND token = 'zi2KxhxTXqmKvFXvS1o49o/o1TMmvkmXzJHyCboNung=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}